US2608997A

US2608997A - Control valve

Info

Publication number: US2608997A
Application number: US640887A
Authority: US
Inventors: Raven Jan Peter Cornelis
Original assignee: Foster Wheeler Inc
Current assignee: Foster Wheeler Inc
Priority date: 1946-01-12
Filing date: 1946-01-12
Publication date: 1952-09-02
Anticipated expiration: 1969-09-02

Description

J. P. C. RAVEN Sept. 2, 1952 CONTROL VALVE Filed Jan. 12, 1946 Q. R P

Q a Q Q W Y/ am km Qm |v NN INVENTOR Jiw PE 776 (OE/VEZ/S l4y- W n-onus:

Patented Sept. 2, 1952 CONTROL. VALVE;

Janleten. Cornelis. Raven, New York, N. Y., as-

si'gnor to, Foster Wheeler Corporation; New 110mm; Y., a corporation of 'Nc'w-York' Applicationvlamuary 12, 1946,)Serial'No. 640,887. 3: Claims. (01'. ran -6'54) 'I'hisrinvention relates: tdvalves; and; morerpar- T ticnlarly; tozcontrol:valves;ior. controllingtheflow Oilflllidlthl'xOWhfitGOfldlllti.

Normally, joontrolvalves: to which the present invention relates are actuated by-fluid! pressure,

either air orrhydraulicvpressure, iniorder; that the,

desired; setting-r of; the; valve: be: obtained and in 1 mthfl-ttsakid settings'bewmaintained, the amount otffluidspressure-determining; the extent to which the valve iszeithervopened on closedthereby: controllingthefiow ofiluid through aconduit. Whenat pressures failure occurs. such control valves usually. movce to: extneme: opened or. an, extremec closed". positiom. the; setting at; which; the valvesiwerezpositioned:priontothe.pressurefailure beingrreleased: Suchpressure: failure may; last. but:v for a? momenta-but when the, fluidi pressuresactuatedzcontrol:yalvesaare; in a complexconduiti system; for: example; in: the: conduits; off. an

oil zrefining runit; many: hours; are: generally used irr adjustmg: and! resetting the valves; to. their.

positiom at the-time ofithapressureiailuree The: present invention provides: a. holding. or shutaofffvalveiior retaining the settingz-ontalfiuid pressure actuated: control. valve;

The-invention" will baunderstoodfrom thei-following description when considered inzconnectiorr with: the accompanying drawing forminga part thcreofiniwhich-r Fig. I is -a sectional'l view: ofthe" holding: valve of the present invention which diagrammatically shows; the valve connected" to fluid actuated control valves; and

Fig: Zii's-a= sectional view taken on the line2=-2 ofFig; 1.

Like characters-of referenceref er to liltepartsv throughout" the views:-

Referringto the -drawing, the holding or shutofffvalve of the present invention comprises a body l flf'having thereina fluid chamber Ii. One

end of the chamberl lis closed'by a resilient member-tr lflrbysmeansof screwthreads: [9 on said.

nut and in said body member. The nut; IB- has a cylinder 2%.witha plunger 21- slidably mounted therein to move toward'and away from the chamber'll; The plunger 2| is acted upon by aspring .431 and engages" a" substantially U -shaped valve stein ormember-22--one'leg-of-which is engaged by the plunger- 2l'and' the other leg 24 of'which is attached to the diaphragm [2. A radial projection 25 extends into the chamber 1 .l and has a 2 V headlli' whichprojects toward the leg 23 011 the stem 22'. Projection has arfiuid passage; 2T in communication with an. outlet connection- 28 in thebody member 12.. The passagell. extends into the headl26. L'eg23 ofvalve stem 22' is provided with .a valve heador closuremeans 29 adapted to. seat onrthe head',26.in sealing engagement-and closethepassage, 21'. Chamber. I] has a fiuidinlet passage. 30 in, communication therewith. and in. communicationwithan. inlet connection 3U in the. body Ill.

Asshown, a. source 3| ofifluid under pressure is in communication witha setting control valve 32; through. av conduit 33'. The. setting control valve. 32 is mountedon an instrument panel haying pressure indicatinginstruments 35 thereon, said valvebeing controlled by a hand wheel 36. One sid'eofithe setting control valve 3.2"is'connected', to the conduit 33, while the} other side thereof" is connected through a conduit 31 to, the inletconnection 30 in the bod'ymember Ill. Conduit. 38, connects inletconnection ll of 'the' body Ill with. the conduit 33. at a pointbetween the sourcejlandlthe; setting control valve'32r Ffluid pressure actuated, control valves.39 control the Outlet passage 21- is thereby. brought into coin-' munication with the; chamber l-l. When the valve headIQ-isinitsunseated position, the fiuidpressure; actuated control valves are in. communicationiwith; the source of fluidpressure, 3lrt hrough the conduit} 42;, outlet passage 21, chamber. H, inletpassage 3.6", conduit. 31', control -valve;32r and conduitt33: Setting control valve;3 2 isradjustcd to permit'sufiicientpressure to flow to the valves 39 to: adjust saidI-valves; to the desired setting s0 that the. required amount. of: fluidmay pass through conduits; 40? and A I;

Should thexfluid pressureiinythersource==3-l fail or decrease for: any reason, .pressuredn thereondu-it r 38 andisource 3] a would: drop; Upon iaipressure; drop in;.the-.:recess; l5; the. pressure-.onthe diaphragm- I2 would'no longer hold rthe valve head 29: in an unseated position in relationship tothepassage ZIjthe drop of? pressureandtthe tension of the spring; 43: causing. thezvalve. head 29 to be seated on the head 26 thereby closing communication between the passage 21 and 3 chamber, II. The valve head, 29 is held in its seated position by the tension of the spring 43. Seating of the valve head 29 holds the pressure in the conduit 42 and on the setting mechanism of the fluid pressure actuated control valves 39 so that the setting of the valves is retained. The

valve head 29 is maintained in its seated position until the desired amount of pressure is restored in conduit 38 and recess I5 whereupon the valve head 29 is unseated.

Since changes may be effected in the form of the invention selected for disclosure without departing from the principles thereof, it will be understood that the invention is not. to be limited excepting by the scope of the appended claims.

. Whatis claimed is: I 1. In combination with a valve having fluidactuated setting means, said setting means being adapted to actuate the valve to a desired setting by fluid under pressure, a source of fluid under pressure, control means for controlling the flow of fluid under pressure, said control means having a fluid inlet and a fluid outlet, conduit means connecting said fluid inlet of the control means and said source, another conduit connecting the fluid outlet of the control means and thefluid-actuated valve setting means, a shutoff valve positioned in said other conduit at a point intermediate the fluid outlet of the .con- 'trol means and the fluid-actuated valve setting means, the shut-off valve comprising a body having a chamber with a fluid inlet in communication with the outlet of said control means and a fluid outlet in communication with the fluidactuated valve setting means, fluid actuated lock ing means associated with said shut-ofi valve for sealing said chamber outlet to prevent the flow of fluid from the fluid-actuated setting means and thereby maintain the pressure therein, and a conduit incommunication with said source of fluid under pressure and said fluid-actuated looking means so that fluid pressure at the source is transmitted to the fluid-actuated locking means, the locking means being operable to move to its open position so as to permit the flow of fluid from said chamber outlet when the fluid in said ,conduit is at a predetermined pressure and to move to its closed position so as to seal said chamber outlet when the fluid pressure at said source decreases below said predetermined pressure to thereby maintain fluid pressure on said valve setting means and retain said first mentioned valve at said desired setting.

2. In combination with a valve having fluidactuated setting means, said setting means being adapted to actuate the valve to a desired setting by fluid under pressure, a source of fluid under pressure, control means for controlling the flow of fluid under pressure, said control means having a fluid inlet and a fluid outlet, conduit means for connecting said fluid inlet of the control means and said source, another conduit conn'ecting the fluid outlet of the control means and the fluid-actuated valve setting means, a shutoff valve positioned in said other conduit at a point intermediate the fluid outlet of the control means and the fluid-actuated valve setting means, the shut-off valve comprising a body having a chamber with a fluid inlet in communicahtion with the outlet of said control means and a 7 fluid outlet in communication with the fluidactuated setting means, a fluid actuated mem- Number 4 her associated with said chamber .outletfor sealing the outlet, spring means adapted .to act on said member and move the same toward sealing position, a resilient diaphragm operably cooperating with said member and responsive to pressure, and conduit means communicating with said source and said diaphragm so that the diaphragm is responsive to said fluid pressure at the source, the arrangement being such that when fluid is at a predetermined pressure at said source the diaphragm maintains the member out of sealing relationship with said outlet against the tension of said spring so that pressure from the control means flows from the inlet through the chamber to the outlet and when the fluid pressure at the source decreases the spring moves said member into sealing engagement with said outlet and thereby maintain fluid pressure on said valve setting means and retain said firstmentioned valve at a desired setting. 3. In combination with a valve having fluidactuated valve setting means, said setting means being adapted to actuate the valve to a desired setting by fluid under pressure, a source of fluid under pressure, conduit means in communication with said source of fluid under pressure and with said fluid-actuated setting means, control means associated with said conduit at a point intermediate the source of fluid under pressure and the fluid-actuated setting means for controlling the flow of fluid under pressure to the setting means from said source, valve setting retaining means comprising a shut-01f valve in communication with said conduit at a point intermediate the controlmeans and the fluid-actuated setting means, the shut-01f valve being disposed in the path of flow of fluid from the control means to said fluid-actuated setting means, fluid-actuated shut-off valve operating means operatively associated with the shut-off valve and constructed to operate the shut-01f valve into an opened position to permit the flow of fluid under pressure from the control means to said fluid-actuated setting'means and into a closed position to maintain fluid under pressure in said conduit between the shut-off valve and conduit is at a predetermined pressure and to permit the shut-off valve to move to its closed position when the fluid pressure at said source decreases below said predetermined pressure to thereby maintain fluid pressure on said valve setting means and retain said first-mentioned valve at said desired setting.

JAN PETER CORNELIS RAVEN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Name Date 993,967 Debauche May 30, 1911 1,576,889 Wulf Mar. 16, 1926 2,339,469

Emanuel Jan. 18, 1944